SMPS inductance calculator

Finding the right inductance value—and peak current rating—for your SMPS converter can be a bit of a hassle. So here’s a little tool to help you! Simply use this calculator, which’ll calculate all the parameters you need to factor in. The calculator supports the common, simple topologies: Boost (step-up), Buck (step-down) and Buck-boost (inversion – positive to negative).

Input values	Output values
For prefixes, use scientific notation. SI prefixes and the associated exponents are: nano: e-9 micro: e-6 milli: e-3 kilo: e3 mega: e6 giga: e9 For instance, 100 mA should be written as 100e-3 in the input field.	Switching topology N/A
Input voltage, typical For variable voltages, select the middle value V Output voltage Does not include ripple, use nominal target value V Desired output current (amperes) This is the maximum output current you wish to support A Estimated efficiency (percent) Estimated efficiency of the converter. Usually above 80%, and below 98%. % Switching frequency (kilohertz) For variable-frequency converters, use the frequency listed (for full load) KHz Rectifier voltage drop at load Typically 0.4 to 1.0V for Schottky and silicon diodes V Calculate	Peak inductor current N/A Ripple current (lower bound) N/A Ripple current (upper bound) N/A Inductance value range N/A

Copyright © David H. Christensen, 2019.